rupert murdoch's top aide has been released from custody after her arrest. one of britain's top cops also resigned. abc's jeffrey kofman reports from london. >> reporter: the scandal that shuttered one of britain's oldest newspapers is nothing less than an earthquake. shaking this country to the core. the casualties just keep mounting. the latest? the head of scotland yard. sir paul stevenson resigned. he insisted he had no involvement in his force's failure to investigate widespread alleged criminal acts by murdoch's journalists. nor the alleged bribery of police officers by reporters. >> i had no knowledge of the extent of this disgraceful practice. or indeed to the extent of it. and the repugnant nature of the selection of victims that is now emerging. >> reporter: and there is more. rebekah brooks, just days ago she was at the apex of power running rupert murdoch's british operations. it is said he considered her his other daughter. on friday, she resigned from the company. she was arrested. the tenth arrest since this scandal erupted two weeks ago. broo